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A Helmholtz coil Helmholtz coil schematic drawing. A Helmholtz coil is a device for producing a region of nearly uniform magnetic field, named after the German physicist Hermann von Helmholtz. It consists of two electromagnets on the same axis, carrying an equal electric current in the same direction. Besides creating magnetic fields, Helmholtz ...
Cause of skin effect. A main current I flowing through a conductor induces a magnetic field H.If the current increases, as in this figure, the resulting increase in H induces separate, circulating eddy currents I W which partially cancel the current flow in the center and reinforce it near the skin.
Maxwell describes the use of the 2-coil configuration for the generation of a uniform force on a small test coil. [4] A Maxwell coil of this type is similar to a Helmholtz coil with the coil distance increased from coil radius to and the coils fed with opposite currents.
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In 1929 he developed the Fanselau coil, a modified version of the Helmholtz coil, which uses a special arrangement of coils to improve the homogeneity of the generated magnetic field. In 1933 he became head of the observatory at Niemegk.
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The Helmholtz International Beamline for Extreme Fields (HIBEF) [6] was set up by the HZDR together with the Deutsches Elektronen-Synchrotron (DESY) at the X-ray laser European XFEL in Hamburg. HIBEF combines the X-ray radiation of the European XFEL with two superlasers, a powerful magnetic coil and a platform for research with diamond stamp cells.
A pair of Helmholtz coils produces a uniform and measurable magnetic field at right angles to the electron beam. This magnetic field deflects the electron beam in a circular path. By measuring the accelerating potential (volts), the current (amps) to the Helmholtz coils, and the radius of the electron beam, e/m can be calculated. [8]